Radio telegraphic and telephonic apparatus



HORACE ST. JOHN DE AULA DONISTHORPE.

RADIO TELEGRAPHIC AND TELEPHONIC APPARATUS.

APPLICA ON FILED APR. 28, 1920.

Patented Aug. 30, 1921.

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UNITED STATES PATENT OFFICE.

RADI TELEGRAPHIC AND TELEPHONIC APPARATUS.

Specification of Letters Patent.

Patented Aug. 30, 1921 Application filed April 28, 1920. Serial No.377,274.

To all whom it may concern:

Be it known that I, HORACE ST. JOHN DE AULA Domsrrronrmsubject of theKing of Great Britain and Ireland, residing at 5 Chancery Lane, London,in the county of London, England, have invented new and usefulImprovements in Radio Telegraphic and Telephonic Apparatus, of which thefollowing is a specification.

This invention relates to improvements in wireless telephonic andtelegraphic apparatus and more particularly to portable receiving setsor apparatus.

This invention consists of a portable wireless telephonic andtelegraphic receiving set comprising inductances, a detector, telephonicterminals and electrical connections made up in book form so that thewave length is varied by opening or closing the book. A further featureof this invention resides in the combination with the book receiving setof a telephone plug and telephones. This invention is also characterizedby the fact that means are provided for maintaining any predeterminedwave length or angular relationship of the hinged parts. Furtherfeatures will transpire in the following description of the accompanyingdrawings, in which Figure 1 is a plan or open book view showing certainparts and a diagram of the electrical connections.

Fig. 2 is a section through the closed book showing details ofconstruction.

Fig. 3 illustrates the method of varying the wave length by changing theangular relationship of the hinged book parts.

Referring to Figs. 1 and 2 the apparatus comprises hinged book parts 1and 2 connected to a tubular hinge member 3 and connected by hinges 4.The hinges have been omitted from Fig. 1 for the sake of clearness.Built into each book part or cover are inductances 5 and 6 preferablyformed of edge-wound fiat metal strip and connected by an electricalconductor 7. Spring screw or other type terminals 8 and 9 in the cover 1serve respectively for connecting u the aerial 10 and earth connection11. %onductors 12 and 13 connect the terminals to the respectiveinductances 5 and 6. Metal corner plates 14 and 15 are fitted as shown.

The tubular hinge member 3 contains a vulcanite or other insulating tube16 into .socket 24 and a which is fitted at one end a detector element17. A rod 18 passing through a metal bush 19 in the vulcanite tubecarries at its extremities a cooperating detector unit 20 and a head orknob 21. A spring 22 interposed between bush 19 and detector unit 20maintains the latter in contact with unit 17 and the knob serves forturning unit 20 to present new points of contact between the detectorcrystals. An electrical conductor 23 connects bush 19 with the aerialterminal 8.

At the other end of the tube 16 a plug metal bush 25 are fitted.Conductor 26 connects the socket to detector unit 17 and conductor 27connects bush 25 to the earth terminal 9. metal telephone plug 28 isbored to take an insulating sleeve 29 through which passes anelectrically conductive rod 30 carrying a plug 31 engaging in socket 24.Plug 28 is shaped to fit bush 25 and a binding screw 32 secures thetelephonelead 33. Telephone lead 34 is secured to the insulated rod 30by a binding screw 35. One or a pair of telephones of suitable type areindicated at 36.

Any suitable type of hinge may be fitted and in cases where hinges areused of the type in which the parts do not retain their angularrelationship by friction then means are provided for locking the hingeparts or the book parts in any predetermined angular position.

The operation of the receiving set described above is as follows: Toreceive signals the telephones are plugged into the book the aerialconnected to terminal 8 and an earth connection to terminal 9. With thebook closed as at 43 in Fig. 3 the set will be tuned to a predeterminedwave length. As the angular relationship of the two book parts or coversisvaried as for instance in the positions 44, 45, 46 and 47 the wavelength is varied. The variometer effect thus obtained varies in range asdesired and according to design.

Although one preferred form of construction has been described above,various modifications may be made as required. For instance a so-called.rtridge type detector may be ada ted to be inserted into the hinge tubeto ma e contact with and be retained by suitably connected clips. Theaerial and earth connections may take the form of plugs and where a,telephone blocking condenser is required a suitable condenser 48 Thedetachable may be built in between the thicknesses or boards of thecovers or book parts and suitablv connected up.

Although a pocket book wireless receiving set has been described above,the invention is not necessarily in this respect limited but may becarried out without limitation as to practical dimensions.

I claim 1- 1. A wireless telephonic and telegraphic receiving setcomprising in combination two book parts and a hollow hinge partwithinductances, a detector, a condenser, telephone terminals, aerial andearth terminals and electrical connections contained therein, telephonesand means for connecting the telephones in operative relationship to thereceiving circuit.

2. A wireless telephonic and telegraphic receiving set comprising twobook parts and a hinge part, hinges connecting the book parts,inductance coils in each book part, a condenser an aerial terminal andan earth terminal each in one book part, electrical conductorsconnecting said terminals and inductance coils to establish a receivingcircuit, a detector, telephone contacts, an electrical cmiductorconnecting one detector element to the aerial circuit, an electricalconductor connecting the other detector element to one telephonecontact, telephone receivers, a plug connecting thetelephones in thedetector circuit and an electrical conductor connecting the othertelephone contact to t h e earth terminal.

3. A wireless telephonic and telegraphic receiving set comprising twobook parts and a hinge part, hinges connecting the book parts,inductance coils in each book part, an aerial terminal and an earthterminal in one book part, electrical conductors connecting saidterminals and inductance coils to establish a receiving circuit, a.detector in the hinge part, telephone contacts in the hinge part, anelectrical conductor connecting one detector element to the aerialcircuit, an electrical conductor connecting the other detector elementto one telephone contact, telephone receivers, a plug connecting thetelephones in the detector circuit and an electrical conductorconnecting the other telephone contact to the earth terminal.

4. A wireless telephonic and telegraphic receiving setcomprising twobook parts and a hinge part, an inductance coil in one book part, aninductance coil in the other book part, a connection for the aerial anda connection for the earth wire in one book'part, flexible electricalconnections between said inductance coils aerial and earth connectionsestablishing a receiving circuit, a detector in said hinge part, aflexible electrical conductor connecting one detector element to theaerial circuit, a flexible electrical conductor connecting the otherdetector element to one telephone contact located in said hinge part, atelephone receiver, a. second telephone contact in said hinge partconnected to the earth terminal, a concentric plug connecting thetelephone in the detector circuit and hinges connecting said book partssaid hinges being adapted to retain said book parts in any predeterminedangularrelationship.

HORACE ST. JOHN de AULA DONISTHORPE.

